Average annual temperature is 14.6 °C
Absolute maximum temperature: 35.7 °C
Absolute minimum temperature: -7.3 °C
Number of sunny days: 179 days
Number of rainy days: 183 days
Number of snow days: 3 days
Look at detailed online map of Riley
* Weather data for Riley United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 19.0 | 24.0 | 24.4 | 28.3 | 28.7 | 32.1 | 34.6 | 35.7 | 32.0 | 29.3 | 25.7 | 17.8 |
| Average daytime temperature (°C) | 11.1 | 14.5 | 15.3 | 20.5 | 24.6 | 27.6 | 31.0 | 29.2 | 27.6 | 21.6 | 16.0 | 11.7 |
| Average temperature (°C) | 5.9 | 8.4 | 8.7 | 13.5 | 17.9 | 20.9 | 24.6 | 23.4 | 20.8 | 15.2 | 9.2 | 6.0 |
| Average night temperature (°C) | 2.4 | 4.0 | 3.6 | 7.7 | 12.1 | 15.1 | 19.3 | 18.7 | 15.2 | 9.9 | 4.1 | 2.0 |
| Absolute minimum temperature (°C) | -6.3 | -7.2 | -7.3 | 0.5 | 3.1 | 8.4 | 15.0 | 13.0 | 11.3 | 4.0 | -5.9 | -5.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.6 | 5.9 | 8.2 | 9.4 | 10.5 | 11.0 | 11.3 | 9.7 | 10.9 | 8.3 | 7.8 | 6.3 |
| Precipitation (mm) | 123 | 126 | 119 | 85 | 58 | 82 | 61 | 122 | 43 | 25 | 50 | 100 |
| Sunny days | 12 | 14 | 18 | 18 | 11 | 12 | 4 | 14 | 17 | 22 | 20 | 17 |
| Rainy days | 17 | 14 | 12 | 12 | 20 | 18 | 27 | 17 | 13 | 9 | 10 | 14 |
| Snow days | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Riley during the most sunny months:
The largest precipitation sum in Riley is at